Compressor for refrigeration systems



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J o CARREY COMPRESSOR FOR REFRIGERATION SYSIEMS Filed July 20, 1925 Dec. 6, 1927. O 1,651,670

J. 0. CARREY COMPRESSOR FOR REFRIGERATION SYSTEMS Filed July 20. 1925 e Sheets-Sheet 2 Dec. 6, 192 7.

J. o. CARREY COMPRESSOR FOR REFRIGERATION SYSTEMS 6 Sheets-Sheet 3 arm Filed July 20, 1925 Irzuezziar Dec. 6, 1927. 1,651,670

J. o. cARREY COMPRESSOR FOR REFRIGERATION SYSTEMS Filed July 20, 1925 6 Sheets-Sheet "4 VI/I/III Dec. 6, 1927.

J. o. CARR EY COMPRESSOR FOR REFRIGERATION SYSTEMS fizzlenzfor" c/afim 0. 'wrrey Mdl/ 6 6 Sheets-Sheet 5 Filed July 20, 1925 Dec. 6, 1927. 1,651,670

J. O. CARREY COMPRESSOR FOR REFRIGERATION SYSTEMS Filed July 20, 1925 6 Sheets-Sheet .v Q 7 .96 w 1 l V a? i M f T L .30 J/ 0 0 H I Imam/Z01 claim 0. Carrey Patented Dec. 6, 1927.

tim rs stares earner series.

JOHN 0. CARREY, OF "ST. LOUIS, MISSOURI, ASSIGNOR 'IO CABBEY-IVIORSE ENG-INEEER. ING COMPANY, OF ST. LOUIS, MISSOURI, A CDBEORATION OF MISSOURI.

ooivrrnnsson For; nnrnlsnnea oiv SYSTEMS. I

Application filed July 20, 1925. Serial No. 44,783.

This imention relates generally to compressors and more particularly to compressors for refrigeration systems, the ob ects or theinventiou being to provide. a compressor whereby the compressor actuating or driving mechanism is placed under a constant load, thereby preventing back-lash oi said driving mechanism.

Still further objects of the invention are to simplify the construction and operation of thecompressors of the class described and provide simple and etli'cient means for separating the oil from the refrigerant and conveying said oil into the main casing.

Other objects of the inventionare to provide improved means torv sealing the main shaft to prevent leakage of oil from said casing, and to provide means cooperating with said shaft for guiding" the pistons in their travels.

With these and other objects in View, my invention consists in certain novel features of construction and arrangement of parts,

hereinafter more 'tully described andclaimedj and illustrated in the accompanying draw-J ings, in which Figure 1 is a vertical cross'section'taken longitudinally through the compressor.

Figure 2 is a vertical cross section taken transversely through the compressor.

Figure 3 is a horizontal cross section taken on line 33 of Figure 2.

Figure e is a bottom-plan view of the compressing head used in conjunction with the compressor.

Figure 5 is a vertical cross section through one of the cylinders and the pistons operating therein and showing the piston at the com:

pletion of the compressing stroke.

Figure 6 is a similar view showing the piston at the completion of the intakestrolre. Figure 7 1s top plan v ew of the plston.

Figure 8 is a horizontal cross section taken.

on line 8'8 of Figure 7.

Figure 9 detail-view of the piston.

adjacent to the mounting of the Figure 10 is a vertical cross section taken transversely through the shaft sealing'ineans ot' thedev-ice. 4 I V Figure 11 isatran'sverse cross section taken adjacent to-thecent-ral sealing member of the shaft sealing device. A I

Figure 12 is a vertical cross section taken diaphragm member of the sealingdevice.

Figure 18 is a vperspective detail view'of one of the washers of special metal used in conjunction'with my seal. K p

Figure 1ft is a perspective detail vie'wot one of the metallic-seal members utilized in the construction of my machine.

. l igure 15 'is an enlarged detail view showing the arrangement of the seal; I j

c Figure 16 is a detail view of the float valve used r011- controlling the passage between the high pressure chamberandthe main casing.

of the va-riousmembers Figure 17 isa detail view ofthe worm and i the worm gear utilizedfor actuating the compressor. 7 Figures l8, l9 and 20 are diagrammatic views showing the positions of the com-V pr'es'sor units during three equally spaced 1 intervals of one operating cycle of the machine. i

Heretotore, the, compressors used in refrigeration systems have been-either of one cylinder or twocylinder type. In the operation of such compressors, there is a period: when; upon completion of the compression or discharge stroke of the piston, a portionf of theycompressed refrigerant remains in the compression chamber and as soon as the piston starts on the return or intakestroke', such refrigerant expands and exerts pressure against said piston, thereby causing said piston to move inwardly a slight distance in advance of its driving mechanism; Thisv slight movement of the piston independently of the driving mechanism is made possibleby the 'p'lay'no'rmally existing in theoperating connections between the pistoneandthe driving mechanism. Such movement of the piston produces a' knock which makes the.

machine undesirable for" use on the same floorwith the living apartments. This knock or noise especially noticeable-in machines having a gearjdrive, such ass seem-drive,

.the actuating mechanism evenly distributed through the complete wherein the expansion of the refrigerant during the intake stroke of the piston produces back-lash in the gear drive v f In the present invention, the compressor units are sodisposed that one or more pistons are always under compression, which opposes and checks the movement of the piston under an intake stroke and maintains the actuating mechanism under a constant load at all times, thereby eliminating knocks and back-lash in the driving mechanism and making the machine practically noiseless. In this manner, a quiet-running machine is provided and the operating stresses to which is subjected is cycle of operation of the machine.

'tion of said casing.

In the type of machine herein disclosed, a worm gear drive is shown and it is especially desirablethat the worm gear be maintained in proper engagement with the worm at all times in order to eliminate back-lash.

Referring by numerals to the accompanying drawings,10 indicates a casing which is preferably of-cylindrical shape and is supported on abase 11 providedwith a concave pocket 12 for receiving the lower por- Aseries of studs 14 are welded or brazed'to casing and extend through suitable apertures formed through" the curved wall of base 11 and receive nuts 15 by means of which casing 10 is secured in position on said base. The upper portion of said casing terminates in an'upwardly presented extension 16 in which are formed cylindrical chambers 17, 18 and 19, respectively, which are disposed in vertical alignment with theaxis of casing 1 0. Casing 10 is preferably formed open-ended and is closed by end plates 20 which are bolted to said cas ing and are provided with radial and endthrust ball bearings 21, in which, are arranged the ends of a shaft 22 which extends axially through said casing.

A series of eccentrics 24, 25 and 26 are keyed to shaft 22 in alignment with cylinders 17, 18, and 19, respectively and engage at diametrically opposed points bearing blocks 27 and 28, said points of engagement being in axial alignment with the respective cylinders. These blocks are held against the respective eccentrics by means of tie rods 29 which arerarranged in pairs on each side of each eccentric. Pistons 30, 31 and 32 are securedto corresponding blocks 27 and operate in the respective cylinders 17, 18 19.

One end of shaft 22 is threaded as indicated at 22 for receiving a nut 34 which bears against the-hub of a worm gear 35 and locks the latter in position. lVorm gear 35 operates in a chamber 36 which is formed in an extension 1O of casing 10 and is separated.

posed between the remaining eccentrics andv asleeve'45 is interposed between eccentric 24 and the corresponding bearing 21., The

ends of these spacing sleeves are provided with annular li -shaped grooves 46 as shown in Figure 12 and the eccentrics are provided with grooves 47 which are arranged eccentrio with the axis of shaft'22 and adapted to cooperate with grooves 46. These grooves are adapted to receive betweenthem metallic rings 48 formed of lead or similar material which rings when hub portion 35 and the spacing sleeves are drawn against each other and against the respective eccentrics and washer 41, provide a metallic fluid-tight seal which prevents the escape of refrigerant or v oil from the interior of casing 10 along the shaft 22 into the worm drive chamber 36.,

Engaging the ends of washer 41 and held in close sealing contact therewith are Washers 49 which are made of special anti-friction material, which may be of metal-alloy or some other'composition. These washers are freely arranged on'hub extension 35 and on spacing sleeve 42 and bearing against said washers and maintaining the latter in close contact with washer 41 are washers 530 which are held in position by spaced flexible plates or diaphragm members 51 secured to said washers in any suitable inanner; These plates are held against annular shoulder 52 by rings 54.

Shoulders 52 are formed integral with casing 10 and project inwardly therefrom to form the dividing wall between the interior of casing 10 and the worm chamber Rings 54 are secured in position in any suitable Inanner.

lit)

A metallic packing, fis ranged on each side of each diaphragm nr 51 and suitable V-shaped grooves formed in shoulders 42 and rings 54 and form a fluidtight seal to prevent the passage of refrigerant from the interior of casing 10 to chamber 36. itotatably mounted on the spacing sleeves and 44 are collars 56 which are adapted to be engaged by tie rods 29 and form a guide during the movement of the. pistons.v

The diaphragm members 51 maintain disks 5O underpressure against disks 49, thereby forming a fluid-tight seal for preventins passage of fluid from the casing chamber to chamber 36' and are controlled bythe pressures'in'the respective chambers so that as the pressure increases in one of the Cllitllb bers, the respective idiaphragm member 51 is actuated to increase the pressure with which the corresponding disk is applied,

responding diski50 against one of the menihers-49, thereby insurin-ga perfect sealing contact between the respectiye members and preventing passage of fluids between the re speetive chambers; i

The chamber of the casing it) is partially filled with oil or other suitable lubricant for lubricating the actuating mechanism of the compressor-and chamber 37 is partially or wholly'filled with oil:while-cha1nber 36 is preferablylill'ed with grease. Housing 40,

'which contains worm 38,-is provided with.

an extension 40 also provided with a suitable seal soithat all danger of the fluid used as refrigerant escapingfrom the machine is eliminated. o

The cylindrical extension '16 is closed at the upper end by a cylinder head 5-7 which is attached inposition by' ineans of bolts; or other fastening, devices 58 which are' seated in the horizontal flange of cylinder head. 57 and, engage horizontal flange 16 of casing 16. Cylinder head 57 consists of an outer Wall 57 'which is preferably rectangular in plan view and rests on horizontal'wall 16'.

of casing 16. "Formed integral with side walls 57 and the horizontal or t'op'wall'57" are partition walls-57 which extend longi- ,tudinally of cylinder head 57 H Il ClLSGIVB to divide the interior thereof into'three chambers, namely a middle or high pressure chamber 59, a discharge chamber 60, and a return or intake'chamber 61, '7 Chambers 59 and, 60 are connected together by ports62 which are formed invone of the partition walls 57 whereby the compressed refrigerant can pass from chamber 59' to chamber 60. Connections, 6 1 convey the compressed refrigerant under pressure to the condenser 0011s of the refrigeration system while connections 65 return the expanded refrigerant to intake chamber 61 after said refrigerant has .been circulated through the refrigeration system. From the intake chamber 61 the refrigerant is conveyed by theconnection 66't0 aport 67 of each cylinder H from which the refrigerant is passed through aport 68 -formed in the peripheral wall. of

each piston into theinteriorathereof during the intake strokeof such piston. ,These 1315- tons are formed open-ended and arc'closed bycup valves 69: which are slidably arranged on the upper ends of said pistons and have; a lost motion relative thereto so that on the intake stroke of the piston'the'cup valve thereof is displacedythereby permitting the refrigerant to. pass from the interior of-the piston through apertures '70 into t-he respective cylindens' I v On the.compress1on stroke of the piston, valve 69 is seated, thereby closing-aperture 70 and trapping the refrigerant inthe cyl-" inder and forcing it under pressure into the high pressure chamber A disk valve Tl is slidabiy mounted in a boss 72 which e3- tends downwardly from the horizontal wall 57 and is disposed in axial alignmentwith.

eachcylinder. This valve is adapted to be,

seatedon topof the corresponding cylinder, thereby closing communication between said cylinder and the highpres-sure chamber 59 so i during the intake stroke of the pistonyth'erei by preventing escape of refrigerant E from high pressure chamber '59 through'the cyl inders. I provided with V-shaped'grooves which when cylinder head 57 IS 1n posit on on casing '16 coincide with similarly shaped grooves formed in thehorizontally disposed"wall l6F= and are 'adaptedto receive suitable' metai packing 74 which formsv a fluid-tightijloint and seals the respective chambers.

Chambers 60 and 61 have arranged therein.

suitable screens'ie disposed at suitable levels" and serving asstrainers toprevent dirt or other foreign substance from "circulating Th'e -upper-"end of'pipe thro'ughthe system.

The faces of walls 57 and 57 are connection .66 extends upwardly through the screen 5-.in chamber 61' and terminates a short distancebelow the top ofsai'd chain ber. Thefl'owerend of lntakepipe. 65 extends downwardly through screen 75and" terminates asshort.distanceabove the bottom of said-cha'mberqgln this manner the re frigerantis discharged below screen 75 and has to pass upwardly through said screen before it is returned to the cylinders;

- In the operation of :the compressor, a oertain amount of oil is carried bythe refrig erantinto the refrigeration system vand chambers 60 arid- 61 serve as separators for collecting the oil and separating it fromthe refrigerant. and returning itto i the casing."

The oil in the-low pressure chamber 61 is returned to the'casingby a-.p1pe connect-ion 76,-the upper end of which extends into said chamber and the lower end of which ex tends through casing 10 into the casing I I chamber. The oil inhigh pressure chamber 60 is discharged by apipe 77"whicli leads" ice from said chamber into thechamber of cas;

ing 10. The upper end of pipe 77 is normally closed by a float valve 7 8 which is ar ranged in chamber 60 and normally closes said pipe and is designed to be opened to discharge the oil when the latter reaches a predetermined" level in chamber 60. This precaution is necessary'in order to prevent the. refrigerant from returning to casing 10. i The machine consists of three compression units or cylinders and the eccentrics or actuating members used for operating the pistons are spaced equidistant about the axis of the shaft, in the present instance, sixty commencement of the intake stroke of the piston, expands in the cylinder and produces back pressure on the p1Si101'l,'Wl1lCh back pressure results in back lash causing noisy operation of the inachinex By usingthree or. more compression units, operatively spaced equally about the axis of the driving shaft, the intake stroke of one of the pistons is opposed by two or more compression strokes ofthe other pistons which overcome the back pressure produced by the piston under intake stroke and maintain a constant load on the shaft so that the back lash and the resultant noisy operation is' thereby eliminated.

-The disposition of pistons during one cycle of the operation of the machine is progressively illustrated in Figures 18 to 20.

In the operation of the machine, shaft 39 driven in any suitable manner actuatesj through worm 38 worm gear 35 which, being fastened to shaft 22, operates eccentrics 24:,

, 25 and 26. These eccentrics having engage ment with blocks 27 to which are secured the lower ends of pistons 30, 3 1, and 32, set in operation said pistons which. compress the refrigerant in the respective cylinders and force said refrigerant under compression into high pressure chamber 59 by unseating the respective valves 71. Each valve 71 is unseated by the compression stroke of the respective piston and as soon as said piston begins its intake stroke, disk 71 is seated due to the pressure prevailing in chamber 59. From chamber 59 the refrigerant passes through port 62 to the lower portion of discharge chamber 60 and then passes 'upwardlyithrough screen 7 5 and is conveyed to the refrigerating system bv Any oil which has been absorbed by the refrigerant in passing through the cylinders is collectedin chamber 60 and dischargedthroughv pipe- 76 back into the casing 10.

through the refrigerating system,it is returned through pipe 65' to the lowerportion of chamber 61 and passes upwardly through screen 75 into the upper portion of said chamber from which itis then led through pipe 66 to one of the ports 67 and when the respective piston reaches" its downward stroke, the correspondin inlet port 68 of said piston isv brought in alignment with port 67 allowing the refrigerant to pass into; the interior of said piston from which 1t then passes through port 70 of the displaced cup valve 69 into the respective cylinder to be compressed and again recirculate through the refrigerating system. a I claim: a y

a' casing havtons, said'eccentrics'being spaced in predetermined relation about the axis of said shaft for spacing thecompression strokes of said pistons equally'through each revolution of said shaft whereby said shaft and said gear drive is under a constant load. c

2. A compressor comprising a main casing, a plurality 'of compression chambers leading from said main-casing, a detachable head for closing the ends of said compression chambers, said head being provided with a high pressure chamber communicating with each of said compression chambers and a high pressure discharge chamber communicating with said high. presure chamber and an intake chamber separate from said high pressure chamber, a valve for controlling the communicationbetween each compression chamber and said high pressure chamber, a. piston operating in each compression chamber, actuating means in sa d main casing for said pistons, a discharge pipe lead-' ing from the upperend of said high pressure discharge chamber, an inlet pipe extending into said intake chamber and terminating in the lower portion thereof, connec' tions leading from said intake chamber to each piston, said pistons being provided with inlet ports adapted to register with said connections, and oil discharge pipes leading from said intake and high pressure discharge chambers to said main casing'for dis: charging thereinto the oil collected in said chambers. i

ByA coinpressor comprising a main'cas- 'maincasin a-.. iston ojeratin win each compression chamber, and operating-connections between said. shaft. and each piston,

said'connections being so disposed that-the ressure strokes of the pistons are equally istributed about the; axis of said shaft.

LA compressor comprisin in combination a main casing provided with a. plural ity of compression chambers leading there- "itrom, a detachable head for closing the ends of said compression chambers, saidheadloemg :PI'OVldQd with an intermediate chamber communicating with said compression chamibers, andv a discharge and an intake chamber,

said. discharge chamber having communication with saidintermediat'e chamber, a con- .nection leading from saidintakechamber to each compression chamber, a hollow piston operating in each compression chamber and provided with a. port for establishing comv.munication between the interiorof said piston-and said-;intake connection, displaceable :valveheadtor each piston rior controlling the passage: of thevcompressible fluidvfrom g the interior of the. piston '"tothe respective .1 compression chamber, check valves arranged in said intermediate chamberfor controlling thecommunication"therebetween' and the res ective. compression chambers, .a revoluble.

. s aft, journaled in said main casing, and means on Sitld ShZlfl) tor actuatingsmdpistons. success vely .in predetermined relation.

5s A compressor comprising a casing pro.-

vided with a plurality 'ofcompression chamj-loersarranged in a straight line with each other, a detachable cyli nder: headzfor closing the ends of said compression :cha'mbersiand I provided-with an intermediate. high pressure chamber common to all of said compression chambers, fand a; high pressure; discharge chamber, and an intake ichamb'er, passage- :Waysflconnecting sa d intermediate chamber W1th' said discharge chamber, connections connecting said intake chamber with each COmPIGSSIOD' chamber, a check-valve for controlling the coii'imunication between each 7 compression chamber and said intermediate V chamber, a revoluble. shaft. j ournaled in said casing, a piston operatingin each-jcompres- .sion i:chamber,.,andi means. carriedby' said shaft for actuating said pistons, said means 6. A compressor comprising a casing pro vided with a plurality of compression chambefs leading tl1e17efI'OD1,-a' detachable head fiorclosing the open ends of said compression chambers, said detachable head'being provided with an intermediate chamber ,conimon to all of said compression chambersiand with-"a high pressure discharge chamber and low pressure intake chamber, a discharge connection leading from the uppeivportion of said high pressure discharge-chamber,:an oil discharge connection leading; from the lower portion of said'highv'pressure chamber to said casing, a float valvein said high pressure discharge chamber controlling: the discharge-of oil'throughzsaid oil discharge connection in accordance with the level siof the oil containedtherein, inlet: connections connecting the intake'chamber with1the-respective compression chambers, saidtinlet I connection terminating in theiupperzportion of said inlet, chamber, an intake connection leadinginto said intake chamben'said intake connection terminating, in the lower portionv thereof, anoil discharge connection {leading from. said intake ,chambertosaid casing, pistons operating in said compression chambers, check valvesfor controllinglthe communication between the respective com pressionqchambers and said intermediate chamber, and means for actuating saidzpistons. V 7.:A compressor. comprising acasingipro- Vided with a plurality ofcompression chambers', leading therefrom, is a' detachable head for closing the open end of said compression chambers, said..detachable headbeing fproe vided with. an intermediate chamber common to all: of said compression chambersi'and.

.with a high pressure discharge chamber and low pressure. intake chamber, a discharge connection leading from: theuppera portion of said: high pressure discharge chamber an discharge of oilthrough said. oil discharge connection in accordancewith the le'\ (el. of .the."-.0i1 conta ned therein, inlet connections vconnecting the intake chamber-with thefrespectiveycompressionz chambers, said inlet 1 connect onterminating in thezupperportion p of said mletchamber,.an intake connection leading into said intake chamben said intake connection terminating in the lower portion thereof, a-strainer arranged .inqsaidiaintake chamber and interposed:between theyrespective ends of said intake pipe and said: inlet ipe, an oil discharge connectiomileading .trom said intakechamberto saidicasing, pistons operating in said compression chambers, check valves for controlling the communication between the respective compreschamber interposed between said high pressure discharge connection and said inlet passage, an Oll discharge connection leading from the lower portion of said high pressure chamber to said casing, a float valve in I said high pressure discharge chamber controlling the discharge of oil through said oil discharge connection'in accordance with the level of the oil contained therein, inlet connections connecting the intake chamber with the respective compression chambers, said inlet. connections terminating in the upper portion of said inletchamber, an intake con- .nection leading into said intake chamber,

said intake connection terminating in the lower portion thereof, an oil discharge connection'leading from said ntake chamber to said casing,. pistons operating'in said compression chambers, check valves for controlling the communication between the respeztive compression chambers and said intermediate chamber, and means for actuating said pistons. V

9. ,A compressor comprising a casing provided with a plurality of compression chambers leading therefrom, a detachable head for enclosing the ends of said compression .chambersand provided with an intermediate chamber communicating with said compression chambers and provided wlth a hlgh pres- SUIG dISChELIgQ chamber and alow pressure 7 intake chamber, said discharge chamber having communication with said intermediate chamber and said intake chamber having communication with-said compression chambers, a check valve for-controlling the communication between each compression chamber; and said intermediate high "pressure chamber, oil discharge pipesjleading from 7 said intake chamber and high pressure discharge chamber tosaid main casing for discharging thereinto the" oil collected in said chambers, a piston operating in each compression chamber, and actuating means in said casing having positive operating connections with said pistons. e

' 10. In a compressor the combination with a main casing provided' with a plurality of communication compression chambers leading therefrom, and pistons operating in said compression chambers, of a detachable head adapted to be secured to said casing for enclosing the ends of said compression'chambers, said j head being provided 'withan intermediate chamber communicating with said com 1 pression chambers and a high pressure dis charge chamber and a low pressure intake chamber, said discharge; chamber having with said intermediate chamber, a connection leading from saidintake chamberto eachcompression chamber, and a check valve for controlling the coin munication between each compression chamher and said intermediate. high pressure chamber. 7 I

11. In a compressor the combination with a main casing provided with a plurality of compression chambers leading therefrom,

and pistons operating in -;said compression.

chambers, of a detachable'head adapted to be secured to said casing for enclosing the ends of said compression chambers, said head being provided with an intermediate chamber communicating withv said compression chambers and a high pressure discharge chamber anda lowpressure intake chamber, said discharge. chamber having communication with said intermediate chamber,a connection leading from said intake chamber to each compression chamber, a check valve for controlling the communi cation between each compression chamber and said intermediate high pressure chamber, a discharge pipe leading from the upper end of said high pressure dischargecham her, an inlet pipe extending into said. inlet chamber and terminating in the lower. portion thereof, and oil discharge pipes leading from said intake chamber and said high pressure discharge chamber to the interior into the oil collected in said chambers.

12. In a compressor the combination with a main casing provided witha plurality of compression chambers leadingtherefrom, and pistons operating in said compression chambers, of adetachable head adapted to be secured to said casing for enclosing the ends of'said compression'chambersy 'said head being provided with anintermediateichamber communicating with said compression chambers and a" high pressure discharge chamber and a low pressure intake chamber, said. discharge chamber having communis cation with said intermediate chamber, a

connection leading from said intake cham-' ber to eachxcompression chamber, .a check valve for controlling the communication between each compression chamber and said intermediate high pressure chamber,. a discharge pipe leading fr'omthe upperend of said high pressure-discharge chamber, an inletp pe extending into said inlet chamber .of said main casing for discharging thereand terminating in the lower portion there- 'of, oil discharge pipes leading from said in' take chamber and said high pressure discharge chamber to the interior of said main casing for discharging thereinto the oil collected in said chambers, and valve means in said high pressure discharge chamber for opening and closing the end or" the oil dis-,

charge pipe leading therefrom.

13. In a compressor the combination with a main casing provided with a plurality of compression chambers 'leadlng therefrom,

, and pistons operating in said compression connection leading from said intake chamber to .each compression chamber, .a check valve tor controlling the communication between eachi'compression' chamber and said intermediate high pressure chamber, a discharge pipe leading from the upper end of said high pressure discharge chamber, an inlet pipe extending into said intake chamber and terminating in the lower portionthereof, oil discharge pipes leading from said intake chamber and said high pressure discharge chamber to the interior of said main casing for discharging thereinto the oilcollected in said chambers, and a float valve arranged in said-high pressure chamber for 1 closing the oil discharge pipe leading therefrom when the oil contained therein falls below a predetermined level and for opening-said discharge pipe When the oil in said high pressure chamber rises to a predeterminedv level.

In testimony whereof I hereunto aifix my i I signature this 16th day of June, 1925.

JOHN OL'OARREYr 

